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FNAL Linac Downtime Overview Proton Source Workshop Fernanda G. Garcia Accelerator Division Proton Source Department December 7-8, 2010 [email protected] X 3798. Few points you need to know... Data presented in this talk was obtained using the Operations Department

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FNAL Linac

Downtime Overview

Proton Source Workshop

Fernanda G. Garcia

Accelerator Division

Proton Source Department

December 7-8, 2010

[email protected]

X 3798


  • Few points you need to know...

  • Data presented in this talk was obtained using the Operations Department

  • Downtime Logger (1977 is the earliest year logged)

  • Data was analyzed exporting data into excel file and filtering entries

  • Legend

Linac Downtime Proton Source Workshop

Fernanda G. Garcia December 7-8, 2010


Linac Downtime History

2000-2010

TLD: ~ 3,470 hrs

CD: 11.0%

Linac Availability : 89%

NuMIslipstacking

Jan’08

Pbar stacking

Aug’04

MiniBooNE

April’02

NuMI

May’05

Linac Downtime Statistics Proton Source Workshop

Fernanda G. Garcia December 7-8, 2010


Linac Downtime History

1977-2010

TLD: ~ 6,660 hrs

CD: 10.5 %

Linac Availability : 89.5 %

Linac Downtime Statistics Proton Source Workshop

Fernanda G. Garcia December 7-8, 2010


Linac Downtime History

Comparing the past decade with the

previous 2 decades

  • Data shows that

  • 52% TLD happened in the past decade

  • Linac RF systems contributed 0.5% more to the CD in the past decade than it did in the previous 23 years

    • HE ~ 42% contribution

      • 1 single failed contributed ~11% of HE downtime (KRF1 replacement)

    • LE ~ 58% contribution

Linac Downtime Statistics Proton Source Workshop

Fernanda G. Garcia December 7-8, 2010


Linac RF System

~ 60% 200 MHz system TLD

~ 40% 805 MHz system TLD

LRF2

LRF4

LRF5

LRF3

LRF1

Linac Downtime Statistics Proton Source Workshop

Fernanda G. Garcia December 7-8, 2010


Linac RF System

Modulator contribution LD ~ 57%

Driver contribution LD ~ 35%

Despite the fact the majority of the modulator downtime is < 30 min, these frequent interruptions

to running a smooth program, occupy

manpower resources with local

response, frequent tuning and

constant attention to Linac beam

quality. They are also a repeated

stress on the system hardware.

Avg: ~ 45 min

Avg: ~4.5 hrs

Avg: ~ 10 min

Linac Downtime Statistics Proton Source Workshop

Fernanda G. Garcia December 7-8, 2010


Linac Downtime Concerns

  • 200 MHz QPS

    • 20 uF 1kV capacitors with 1.6 lb PCB oil

    • 12 capacitors/supply ~ 120 supplies

    • Major downtime risk due to environmental impact and extensive of cleaning on other components which will get affected by this failure.

    • Currently replacing the PCB with non-PCB caps

  • Ignitron in the Modulator Capacitor bank

    • Hg -> environmental problem if it explodes

  • Drift Tube Failure

    • Historical fact: 5 quadrupole failures over Linac Operations

      • Tank 2:

        • 3 failures, all caused by ground fault in the magnet.

      • Tank 5

        • 2 failures initiated by water leak in the stem box

      • Typically is possible to adjust other magnets (isolation transformer)

      • Multiple failures, problem becomes more challenging and perhaps

      • Impossible to sustain operations until magnets are replaced.

Linac Downtime Statistics Proton Source Workshop

Fernanda G. Garcia December 7-8, 2010


Pre-Accelerator Downtime System

During the past 10 years

11.5% TLD

1.2% CD

H-system (6.7% TLD, 0.7% CD)

I- system (3.3% TLD, 0.4% CD)

  • Largest Single Downtime

  • 2006

    • 26 hrs: Short on the H-

  • extractor. I- turn on/tune up.

  • 2010

    • 52 hrs: H- source repair.

  • I- column under repair and H- source died

  • Operation Risks

    • Haefely failure

      • lack of experience

    • Overall lack of experience

      • past 2 years Dept. lost 120 years

      • of expertise/experience

    • Loss of redundancy

Linac Downtime Statistics Proton Source Workshop

Fernanda G. Garcia December 7-8, 2010


Pre-Accelerator Downtime System

During the past 33 years

~ 15% TLD

~ 1.5% CD

  • Largest Single Downtime

  • 1983

    • 15 hrs: I- source replacement

  • 1993

    • 22 hrs: H- generator died

Reliability is a concern

for instance in 1988 there was

no single failure.

The downtime was a combination of small power supply trips,

regulation issues which caused interruption to a smooth running.

Downtime (hrs)

Linac Downtime Statistics Proton Source Workshop

Fernanda G. Garcia December 7-8, 2010



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